Charles frederick eox allan



c. FIF. ALLAN. PRQTECTIVE COVERING FOR PNEUMATIC TIRES. APPLICATION FILED JUNE II, I9I8 1 ,$324,368. Patented Dec. 9; 1919.

4 fri' UNITED srArEs PATENTFFCE l CHARLES FREDERICK Fox ALLAN, or sYDNExNEWsoUrH WALES, AUSTRALIA.

PRoTECTIvEoovERIN'G Eon rNEui/m'rro'"rIEEfs .-vv 1 To all whom it may concemf Be it known that I', vCHARLES FREDERICK Fox ALLAN, a subject ofthe Kingo'f Great Britain and Ireland, residing at 1123/131V -Castlereaghstreet, Sydney, New South Wales, Australia, havein'vented new4 and Y useful Improvements in@ Protective Coverings for Pneumatic Tires, of' which the following is a specification.

Thisy invention may be appliedto all kindsI of'pneumatie tires, but it is specially applicable for use with motor cars.

Therejare three main parts in the proteci tive'covering, consisting of Vthree wide, concentric, corrugatedV ringsV of thin metal; to

the outer corrugated ring adheres a solid tire of' suitable' material, "constitutingfffthe tread of the wheel. 'The inner' and `inner most Vcorrugated rings are providedwith side pieces, part-s of each of which projects inward toward the center of the wheelso as to'partially embrace the sides of thev pneu; matictire, 'andp'art off each of which pro'- jects outward toward the periphery of the wheel sonas to` partially embrace thev sides 'ofthe solid tire or tread. Means are provided for bindingY the yparts together-and for 'securing theprotective covering inposi 'tienover the pneumatic tir'ef n' In the vaccompanying;drawinzg'gs :4 Figure l is a vieiv'of half awheel to which the invention is applied7'the left side beingy in elevation while the right side isin'y verticalv section taken on the line 1 -1 ofFigi 2'.,

`F 2is a transverse vertical` section oi he invention, takenon the line 2'- -2' of i l. l. I

1 ig. 3 is a planofa small segment ofthe outer ring straightened'out, showing the disjf ment vof Ithe innermost corrugatedl` ring; 4 showing the transverse corrugations, 1nV

position, inpairs, of the transverse' c orruga;- tions.l Y j' .Y Y

Fim 14'z is a ers ective vlew of, a small segment of the inner corrugated ring, showlng the transverse corrugat1ons, 1n pairs," andV the disposition'of the side piece integral with the ring. Y i j Y Fig. 5` is a perspective view of a small segs pairs', domes Vbetween the sets; of pair-sof corrugations-,- and the disposition of theside piece integral with .thef ring.

' Figs. 4 and 5v are also, suggestive of a mode whereby the innerv andl innermost rings, w ith vtheir respective side pieces, maybe' made sheet metal stamped and formed to the de- A Jpart of which projects inward` toward the vcenter of the wheel in order to partly em-V brace one side of the covering E ofthe pneumatic tube F, and' part of whichprojects outward toward, the periphery of the wheel inorder' to partly embrace one side 'of the solid tire or tread' B.' l/Vhen in position,V the corrugations c, c, will enga-gewith the corruga-V tions a, a; thusLthe two rings A,C,' will be prevented from ycreejlwing Vindependentlyf of eachother; "f Y G isi-'the innermost ring, concentric withAy and C, and providedwith transverse corrugationsfg, g, arrangedin pairs, as shown in Figs. l and 5. Integral'withthering GY isa side piece H, having the'same function as the sidepiece D, beingadapted to partly vSpecicationfof Letters `laiteznc. l 1)(23G,y 9, 1919,. application-medians 11, 1era. serial 1510.239352.

embrace one side of the' covering E andfoneside of the solid tire or tread B, on the side lofthewheel opposite to-D. Between the' It is not necessary that the.jcorrugations c, f/Y,A should extend'quite across the full Width oftheir respectivelringsg 'it'l willgbe sufficient if they be'made. suii'ci'ently long'- toz just allowthec'orrugations Vof the other ring'- witlrvvhich they are'engaged to lieY beneath them; but the corrugationsfil" nius't extend right acrossthelring G or bolts could' 'not be i passed vthrugh them.

Thev felly of the wheel is` shown at L; at equal intervals, projecting radially from the felly toward the center of the wheel are flat studs M, down the centers of which are slots m. At similar intervals, the side pieces D, H, are extended radially toward the center of the wheel so as to form straps D, H', whereby the protective covering, as a whole, may be secured to the studs M, on the felly L, by means of bolts and nuts Z. rI`he protective covering, consisting of the three concentric rings, the solid tire or tread, and the side pieces, will thus be prevented from creeping around the pneumatic tire in either direction.

The side pieces D, H, and the straps D', H', should not fit too closely to the covering E of the pneumatic tube, but should be allowed a certain amount of play so that the resilience of the pneumatic tire may not be impaired. The connections between the auxiliary rim or outer ring A and the rim or felly member L of the wheel are spaced` from the pneumatic tire at all times the contact between the auxiliary' rim and the..

pneumatic tire being only at the points where the protuberances enga-ge the tread of the tire, and the slots m in the studs on the felly will be of assistance in this respect. An allowance for play is shown in Fig. 2.

Besides the holes cl, 7b, in the side pieces D, H, through which the securing bolts will be passed, the side pieces will be pierced at regular intervals with a series of holes N through which air may enter the protective covering; the domes K, will also be pierced with holes, to allow air to circulate.

The inner and innermost rings C, G, with theirrespective side pieces, may be made byV any suitable method known to engineering science, but a convenient mode is suggested by the sketches at Figs. 4 and `5, whereby lthe parts may be stamped out of sheet metal and then bent and shaped to thc desired form.

When the protective covering is to be iny stalled in position, the corrugated ring A, with its solid tire or tread B, will be loosely placed around the pneumatic tire, the iiiner and innermost rings being forced Vin from the sides, so that the sets of pairs of corrugations on each ring shall engage with the sets of pairs of corrugations onvthe adjacent outer ring; the side pieces will then be bolted together by bolts passing through the corrugations J and the side pieces D, H; the straps will then be bolted to the studs M and thus the several parts, viz: the three concentric corrugated rings, with the solid tire or tread, and the side pieces will be secured together so that they shall form al ring around and a protective covering to the pneumatic tire, without in any way impairing the resilience of the pneumatic tube.

The side pieces D and H and the con-V necting bolt foi-n1 rim embracing yokes. The annular series of spaced convex or dome shaped protuberances K maintain the pneumatic tire in spaced relation with the body of the annular protective covering and when a wheel encounters an inequality of a road the dome shaped protuberances at the bottom portion of the wheel will'indent slightly the tread of the pneumatic tire around a considerable portion of the same so that instead of having a localized com-j pression of the tire at the bottom ofthe wheel the compression will be distributed over a relatively large surface of the tread of the tire by means of a plurality of in dentations produced by the dome shaped protuberances and as a result of this action only very little relative inward movement of the protective covering is required in the cushioning action of the pneumatic tire and only a small amount of yplay is necessary at the slots m to permit such action.. It has been found in practice with a full sized automobile wheel that the amount of inward movement of the protuberances in indenting the pneumatic tire is approximately g .of

an inch and the slots m will be of sufficient -ring surrounding the 4tire and having'projections formed on its periphery, a solid tiresecured to said ring, a second ring interposed between said pneumatic tire and ring and formed with corresponding depressed portions to receive said projections. a' third ring interposed between said second ring and the pneumatic tire `and formed with channels to receive said depressed por' tions, said third ring being provided with spaced dome shaped inwardly projecting protuberances fitting against the tread of the pneumatic tire and adapted to produce slight indeiitations in the same around a considerable portion thereof, centrally of' the tread, whereby excessive local compression of the pneumatic tire is prevented and converted into tread vibrations, andmeans for connecting the rings with the pneumatic tire, the connecting means between the solid tire and the pneumatic tire being spaced from the sides of the pneumatic tire at all times and the contact between the said tires` being` only at the points where the protuber` having projections formed on its inner pev riphery, a solid Vtire carried by said ring, ay

second ring interposed between said pneuf` matic tire and ring and formed with corresponding depressed portions to receive .said

projections, a third ring interposed between. said second ring and the pneumatic tire and yformed with channels to receive said dethe third ring and tting against the tread or' the pneumatic tire and adapted to produce slight indentations therein around a considerable portion of the saine to eliminate excessive local compression of the pneumatic tire, flanges formed on the second and third rings and partly embracing the pneumatic tire, straps carried by the `flanges' and studs formed on said rim and having a loose connection with the straps, the connecting means between the solidtire and the Y pneumatic tire being spaced from the sides 15 of the pneumatic tire at all times and the contact between the said tires being only aty the points Where the protuberances engage the tread of the pneumatic tire.

In testimony whereof I have signed my 20V name to this specification in of two subscribing Witnesses.

CHARLES FREDERICK FOX ALLAN. Vl/Vitnesses:

R. MASSEY,

H. C. CAMPBELL.

the presence 

